What is the purpose of Thread.Join() method in .NET?

Now if you want to block execution of sample1Thread until sample2Thread finishes its execution, then you can do it by calling sample2Thread.join(). This code statement will put sample1Thread on wait until sample2Thread execution gets completed. After sample2Thread finishes, sample1Thread will continue its execution.

What if sample2Thread runs for a long time and sample1Thread cannot wait until it gets completed, then instead of calling sample2Thread.join(), you can call sample2Thread.join(10000) where 10000 means that sample1Thread will wait for next 10 seconds within which it expects the sample2Thread to finish its execution. If sample2Thread couldn’t finish its job in 10 seconds, then the sample1Thread will continue its execution even if sample2Thread is still executing.

Here is an example that makes main Thread to wait until sampleThread finishes its execution:

class sampleClass {
public static void Main() {
Thread sampleThread = new Thread(new ThreadStart(sample));
sampleThread.Start();
sampleThread.Join();
Console.WriteLine("Continues execution of main thread");
}
static void sample() {
Console.WriteLine("In sample");
for (int index = 0; index < 2; index++) {
Console.WriteLine("Iteration {0}", index);
Thread.Sleep(2000);
}
}
}

Output of this code will be:

In sample
Iteration 0
Iteration 1

Continues execution of main thread

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